Drill.



H. HUNDRIBSER.

DRILL.

APPLICATION FILED Nov. so, 1912.

Patented Jan. 6, 1914.

[n ven/0r.

/g/M jv@ HANS HUNnRInsEn, oF HALENSEE, 'NEAR BER'LIiv; Grimani DEEL.

rossana.

Specicatoh `of Letters Patent.

Patented Jan. 6, 1914.

Application filed November 1.30, 1912. Serial No. 734,256.

To (1N wie om it may concern Be it known that I, HANS HUNDRInsnR,sculptor, a` subject of the King of Prussia, residing atJoachim-Friedrich strasse 10B, Halensee, near Berlin, Germany, haveinvented certain new and useful Improvements in Drills; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art' to which itappertains 'to make and use the same.

out loosenin of any securing organ merely by pushing t e cutter into aslot of the drill head by hand or by pulling `it out on the oppositeside respectively, as well as by adjusting the cutter after being wornout merely by pulling it out to t-he desired length. For this purpose apawl'is situated in the interior of the drill head and on one partaccepts the working pressure while it on the other part readilydisengages the cutters for the above said movements.

Referring to the accompanying drawings Figure l is a side view of thedrill headwith 3 cutters, Fig. 2 is a perspective view of' the same withremoved front side piece, turned about its vertical axis through anangle of 9()O and tilted a little out of the plane of the drawing. Fig.3 is an upper plan View. Fig. 4.- is an elevation of the drill withrectangular section, Fig. 5 is ai section on the line lr-B of Fig. 4 andFigs.

` G, 7 and 8 are elevations of the drill head showing circular-l)ycurved cutters 0r slots consists of the middle part a and the two icutter.

side-pieces or cheeksl), b. This division however is merely afforded inorder to enable one to work out the slots c and the recesses f; havethese once been made and the pawl Z been mounted, the side-pieces orcheeks are laid against the middle parta and secured in any' suitablemanner by means of rivets or screws with'countersunk heads, passingthrough the holes t. The whole of the drill head is further providedwith spiral slots c on its outer surface in order to convey the refusematerial. The pawl d is situated in the recess f of part a and issecured to the axle (j. The latter may penetrate one of the side-piecesb and' may at this end be of square section so as to be actuated by asquare Spanner and, if desired, disconnect the pawl d. In order to .putin a cutter /c t-he latter is pushed with its frontend into the rearopening of the slot e and is then shifted in the same whereby the pawlsnaps into the notches of the Has the latter by mistake been pushed toofar the pawl can be disengaged by the means described above and thecutter then shifted back one or two notches. The

.pawl d receives the pressure of the cutter when working.

In Figs. 4 and 5 a drill head of rectangular section is shown inwvhichthe spiral slots ke of Fig. l are done away with, as owing to the flatform of the drill head the refuse material can easily be removed out ofthe borin hole. ,In iigs. 6, 7' and 8 the same drill head is shown as inFigs. 4:.k and Here however the cutters are circularly curved andaccordingly the slots have also such a shape, the plates s, s herebybeing connected together by means of rivets or screws.

Having thus fully described my invention what claim as new and desire tosecure by Letters Patent is:

1. A drill comprising a head having an obliquely extending bore, and arecess communicating with said bore, a longitudinally adjustabletool'accommodated within said bore and provided with a rack facing thehead-recess, and a spring-influenced pawl pivoted to the head within therecess and adapted to engage the rack.

im 4 y imam 2; A drill comprising a head composed of named section andconfining the tool within a rst section having a groove and a recess thegroove.

communicating' with the oove, a tool having a rack and slidable Withinthe groove; a 5 spring-influenced pavvl pivotally mounted Witnesses: g

within the recess and engaging the rack, and WOLDEMAR HAUPT, v a secondhead-section secured to the rst HENRY HASPER.

i HANS HUNDRiEsER.

